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Building Cisco Multilayer Switched Networks. Student Guide by Cisco Systems

By Cisco Systems

A community with excessive availability presents replacement capability in which all infrastructure paths and key servers could be accessed ax all instances. the new Standby Router Protocol (HSRP) is a kind of software program good points that may be configured to supply Layer three redundancy to community hosts. HSRP optimization presents instant or hnk-specific failover in addition to a restoration mechanism. digital Router Redundancy Protocol (VRRP) and Gateway Load Balancing Protocol (GLBP) are derivatives of HSRP, offering extra Layer three redundancy beneficial properties equivalent to load balancing.

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Objectives Upon completing this lesson, you will be able to describe and configure gateway redundancy protocols (VRRP and GLBP). , for the sole use by Cisco employees for personal study. The files or printed representations may not be used in commercial training, and may not be distributed for purposes other than individual study. Describing VRRP This topic describes VRRP. VRRP © 2006 Cisco Systems, Inc. All rights reserved. 0—5-2 Like HSRP, VRRP allows a group of routers to form a single virtual router.

The files or printed representations may not be used in commercial training, and may not be distributed for purposes other than individual study. Establishing HSRP Priorities In this step the HSRP priority is set and verified. Configuring HSRP Standby Priority • The router with the highest priority in an HSRP group becomes the active router. • The default priority is 100. • In the case of a tie, the router with the highest configured IP address will become active. © 2006 Cisco Systems, Inc. All rights reserved.

The master down interval is the time interval for backup to declare the master down (in seconds). The default is 3 x advertisement interval + skew time. „ The skew time (256 – priority / 256) ms, ensures that the backup router with the highest priority becomes the new master. © 2006 Cisco Systems, Inc. , for the sole use by Cisco employees for personal study. The files or printed representations may not be used in commercial training, and may not be distributed for purposes other than individual study.

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